Apparatus for directed wireless telegraphy and telephony.



E. BELLINI.

APPARATUS FOR DIRECTED WIRELESS TELEGRAPHY AND TELEPHONY.

APPLICATION FILED JUNE 19. 1915.

v Patented Apr. 3, 1917. .5 Q2

Ebbore Be/l/Ili [men ETTORE BELLINI, OF ENGHIEN-LES-BAINS, FRANCE.

APPARATUS FOR, DIRECTED WIRELESS TELEGBAPHY AND TELEPHONY.

Specification of Letters Patent.

ratenma'a r. a, 19 17.

Application filed June 19, 1915. Serial No. 35,103.

To all whom it may concern:

Be it known that I, ETToRn BELLINI, subject of the King of Italy, residing at 49 Boulevard Cotte, Enghien-les-Bains, Seine and Oise, in the Republic of France, have invented new and useful Improvements in Apparatus for Directed Wireless Telegraphy and Telephony, of which the following is a specification.

This invention has for its object to provide wireless telegraph and telephone apparatus which allows, in regard to transmission, of controlling the direction of maximum projection of electromagnetic waves, without turning the antennm, and in regard to reception of making adjustment for reception from selected directions and ascertaining the direction of the transmitting station, also without moving the antennae.

The apparatus essentially comprises pairs of fixed conductive plates arranged around an axis, diametrally opposite each other, the

number of pairs being equal to the number of aerials for directed waves, and the two opposed plates of each pair being connected to one of the aerials. Opposite the fixed conductive plates are arranged rotatable conductive plates directly or indirectly con.- nected to high frequency apparatus such as a sparking device, an arc, an alternator or a detector. These rotatable plates are mechanically connected to each other and can be rotated about the axis of the fixed system, so that they can be placed opposite the two plates of any of the fixed pairs, or in any intermediate position. The fixed conductive plates and the movable conductive plates are arranged respectively in parallel planes, a short distance apart. The movable plates are preferably given special shapes, as will be described hereinafter.

The invention is illustrated in the annexed drawings, given as an example.

' Figure 1 shows one form of construction of the apparatus, and r Fig. 2 a modification thereof.

The apparatus shown in Fig. 1 comprises two pairs of conductive metal plates (2 a, b 5 arranged in one plane, the plates belonging to each pair being diametrally opposite each other. These plates are in the form or" quadrants, and almost entirely cover a circular surface having approximately the radius of the quadrants; between them is left only suficient space for insulation. The

two diametrally opposed sectors a a are connected to an aerial 1 for directed waves, and the two sectors 5 b are connected to a similar aerial 2 perpendicular to the aerial 1. Each of these aerials may be formed in the well known manner either by a couple of vertical antennae, or by a frame, or by any type of directed wave aerial which radiates and receives with the maximum intensity in its own plane.

Above or below the fixed sectors a b there is a rotary system consisting of two circular plates a mechanically connected together, but insulated from each other. Instead of circular plates I may however use two square plates having their homologous sides parallel, or two quadrants or the like. These two plates 0 do not extend at any point beyond the circle formed by the four sectors, a I). They are arranged to rotate gap device and 'i the inductance in the primary circuit ofa transmitting station.

With this device, when the line MN which represents the greatest dimension of the rotary system, coincides with one of the directions AA, B-B, CC or DD the intensity obtained in transmission is greatest in the direction MN. 'If the line l d-N occupies an intermediate position, coinciding for example with the direction F-F, the direction of maximum intensity makes with the line MN a definite angle which can easily be determined. It will, therefore, be understood that with a device of this kind. and with the aid of a suitably prepared correcting table, adjustment can be inade for transmission in any desired direction. All that is required is to rot-ate the movable system in such a manner that its line M\ lies in the required direction, if the latter is the direction A-A, BB, (."C or Dii) or makes with the required direction an angle given by the table. Similarly in the case of a receiving station, to find the direction of a transmitting station all that is required is to rotate the movable system till the intensity attains its maxi- 'mum, the direction required being that of A convenient arrangement is to give the plates of the movable system an outline'determined by a line given by the equation p p /00S. a

60, or generally speaking it aerials at 180 the number of pairs of fixed sectors varying accordingly. The movable system of the apparatus may be made to act upon the aerials in any convenient, known manner, the arrangement shown being merely given as an examplein the cas of a transmitter. A plurality of systems of fixed and movable plates may be superposed in order to increase the capacity of the apparatus.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. An apparatus for directed wireless telegraphy or telephony comprising in combination aerials for the reception or transmission of directed waves, fixed conductive plates arranged about an axis, diametrically opposite each other in pairs, the number of pairs being equal to the number of directed aerials, and the two plates of each pair being connected to one of the aerials,'a rotary equation system of conductive plates mechanically connected together and adapted to-rotate about the axis of the fixed system,and a high frequency apparatus to which the rotary system of conductive plates is connected, substantially as described andfor the purpose set forth.

' 2. An apparatus for directed wireless telegraphy or telephony comprising in combination aerials for the reception'or transmission of directed waves,fixed conductive plates arranged about an axis in a plane,- diametrically opposite each other in pairs, the number of pairs being equal to the number of aerials, and the two .plates of each pair being connected toone of the aerials, a rotary system of conductive plates parallel to the fixed plates and mechanically connected together, said system rotating about the axis of the fixed system and the outline of the said movable plates being given by the ETTORE BELLINI. Witnesses ANTOINE LAvoIs, DE "W. C. Poona, Jr. 

